Abstract
In this work we outline a simple and numerically inexpensive approach to describe the spectral features of the single-impurity Anderson model. The method combines aspects of the density-matrix embedding theory (DMET) approach with a spectral broadening approach inspired by those used in numerical renormalization-group methods. At zero temperature for a wide range of , the spectral function produced by this approach is found to be in good agreement with general expectations as well as more advanced and complex numerical methods such as DMRG-based schemes. The theory developed here is simply transferable to more complex impurity problems.
2 More- Received 28 November 2016
- Revised 11 February 2017
DOI:https://doi.org/10.1103/PhysRevB.95.155111
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